Abstract
Introduction: Bone stock in revision total hip arthroplasty is one of the most important issues for the orthopaedic surgeon. Different options have been described to manage acetabular bone defects. We reviewed the clinical and radiological results of two different uncemented oblong cups
Material and methods: 18 LOR (Sulzer) and 21 BOFOR (EndoPlus) uncemented cups were evaluated. Morsellized cancellous bone graft was used in all cases but 3. Mean follow-up was 31.6 months. Mean patient age was 72.3 years (32 to 91). Bone defects were classified according to Paprosky’s criteria. Clinical and radiological results were recorded.
Results: There have been no infections and no re-revisions in this series, although one patient is awaiting evaluation for re-revision. Clinical results improved according to the Harris Hip Score from 44 to 75 points. 34 cups were considered stable and 5 showed migration. All unstable cups were implanted in patients with type IIIA or IIIB bone defects. We observed the appearance of non-progressive radiolucent lines of less than 2 mm in 7 hips, sclerosis lines in 1 and acetabular osteolysis in 2.
Conclusions: Uncemented oblong cups are a valid option in revision total hip arthroplasty. The results were worse in patients with major acetabular bone defects. A longer follow-up is needed to evaluate these cups and confirm our findings.
Correspondence should be addressed to Ms Larissa Welti, Scientific Secretary, EFORT Central Office, Technoparkstrasse 1, CH-8005 Zürich, Switzerland
